A joint error correction and ICI cancellation algorithm for OFDM systems

Orthogonal Frequency Division Multiplexing (OFDM) is a spectrally efficient and robust digital communication technique adopted by the newly developed Wireless Communication standards. Frequency offset errors due to Doppler shifts disturbs the alignment of the orthogonal subcarriers and causes them to overlap with each other which results in Inter Carrier Interference (ICI). This paper proposes the use of channel estimation for ICI cancellation. The channel frequency response at pilot subcarriers is estimated by using Least Square (LS) estimator. Along with this the (23, 12, 7) Golay Code has been employed in order to further improve the Bit Error Rate (BER) performance of the system. Simulation of the proposed OFDM system is carried out for Stanford University Interim (SUI) Channel model 6 in the existence of Additive White Gaussian Noise (AWGN).